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As we know, currently most sites depend on cookies being enabled in the browser, including Sitecore which handles personalization, tracking analytics etc.
Why are most of sites now, not displaying the message that browser Cookies are disabled?
There are really 2 questions here. So lets deal with each of them:
The answer to that is not really opinion based, its a legal issue. If you run a website that is owned in the EU you must make sure that your website complies with the latest "cookie laws" - The law is fairly detailed, but the basics say that:
Individuals have the right to refuse the use of cookies that reduce their online privacy
source: The Cookie Law
It is important to note, that if the user declines cookies - you must not set cookie values on your site - the user should not have to turn cookies off in the browser to decline them.
Another important thing to note is that only certain tracking cookies can be declined. Cookies that are essential to the "business" use of the site, can still be stored. E.g. forms auth cookies.
Just because a cookie is declined or disabled, Sitecore will still track the user in a single session. Declining or disabling cookies does not require you to disable the tracker.
What you will lose is the ability to track anonymous users from session to session. You will not get a global session for that user.
